19-1736; Rev 0; 7/00
Triple/Dual-Mode
CDMA LNA/Mixers
________________General
Description
The MAX2323/MAX2325 are low-noise amplifier (LNA)
plus mixer ICs optimized for code-division multiple-access
(CDMA) applications in both cellular and PCS bands. The
MAX2323 addresses dual-band, triple-mode CDMA appli-
cations by providing switched signal paths for cellular FM,
cellular CDMA, and PCS CDMA. The MAX2325 is a cellu-
lar-band dual-mode version.
To optimize cellular-band dynamic range at minimum cur-
rent, the MAX2323/MAX2325 implement four LNA states:
high gain/high linearity, high gain/low linearity, midgain,
and low gain. In high-gain/high-linearity mode, the
adjustable high-intercept LNA minimizes desensitization in
the presence of a large interfering signal. For the other
gain states, the LNA current is reduced to improve stand-
by time.
The CDMA mixers are designed for high linearity, low
noise, and differential IF outputs, while the FM mixer is
designed for lower current and single-ended output. Each
band is implemented with a separate mixer to optimize
performance for the specific band.
The MAX2323/MAX2325 can also be used in TDMA,
EDGE, and W-CDMA phones.
____________________________Features
o
2.7V Operation
o
Dual Band, Triple Mode
o
Three LNA Gain Settings (Cellular)
o
Two LNA Gain Settings (PCS)
o
18mA in Low-Gain Mode
19.5mA in Paging and Midgain Mode
26.5mA in High-Gain, High-Linearity Mode
16.5mA in FM Mode, High-Gain, Low-Linearity
Mode
o
2.5dB (typ) Cascade Noise Figure
o
Adjustable LNA IIP3, +5dBm to +13dBm
o
Ultra-Small 28-Pin Package (5mm x 5mm)
MAX2323/MAX2325
Ordering Information
PART
MAX2323EGI
MAX2325EGI
MAX2323EVKIT
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN- PACKAGE
28 QFN
28 QFN
28 QFN
________________________Applications
CLNAOUT
Pin Configuration/
Functional Diagram
PMIXIN
23
GND
GND
Dual-Mode Cellular Phones
28
27
26
25
GND
24
22
RLNA 1
CMIXIN
Dual-Band, Triple-Mode PCS/Cellular Phones
TOP VIEW
PLNAOUT
21 RBIAS
20 CDMA+
19 CDMA-
18 GND
Typical Application Circuits appear at end of data sheet.
PLNAIN 2
GND 3
CLNAIN 4
SLEEP 5
G2 6
G1 7
MAX2323
17 BAND
16 V
CC
15 FMOUT
8
9
10
11
12
13
14
LOLIN
LOHIN
GND
GND
GND
GND
QFN
________________________________________________________________
Maxim Integrated Products
MODE.
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Triple/Dual-Mode
CDMA LNA/Mixers
MAX2323/MAX2325
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ...............................................................0.3V, +4.3V
Digital Input Voltage to GND ......................-0.3V to (V
CC
+ 0.3V)
LNA Input Level .....................................................................1Vp
LO, Mixer Input Levels .....................................................+5dBm
Digital Input Current .........................................................±10mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin QFN (derate 28.5mW/°C
above T
A
= +70°C) ...................................................2000mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +3.6V, R
RBIAS
= 20kΩ, R
RLNA
= 24kΩ, T
A
= -40°C to +85°C, no RF applied. Typical values are V
CC
= 2.75V and
T
A
= +25°C, unless otherwise noted.)
PARAMETER
PCS CDMA MODE (MAX2323)
Midgain mode
Operating Supply Current
High-gain, low-linearity idle mode
High-gain, high-linearity mode
CELLULAR CDMA MODE (MAX2323/MAX2325)
Low-gain mode
Operating Supply Current
Midgain mode
High-gain, low-linearity idle mode
High-gain, high-linearity mode
FM MODE (MAX2323/MAX2325)
Low-gain mode
Operating Supply Current
Midgain mode
High-gain, low-linearity mode
High-gain, high-linearity mode
SHUTDOWN MODE
Shutdown Supply Current
ALL MODES
Digital Input Logic High
SLEEP Input Logic High
Digital Input Logic Low
Digital Input Current High
Digital Input Current Low
-25
Except SLEEP input
2.0
V
CC
-
0.6
0.6
5
V
V
V
µA
µA
SLEEP = high
1
25
µA
15
16.5
16.5
23.5
18
20
20
28
mA
18.0
19.5
19.5
26.5
21.5
23.5
23.5
31.5
mA
20.5
22
25.5
24
25.5
30
mA
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Triple/Dual-Mode
CDMA LNA/Mixers
AC ELECTRICAL CHARACTERISTICS
(MAX2323 EV kit, F
PLNAIN
= 1960MHz, F
CLNAIN
= 881MHz, F
IF
= 110MHz, high-side LO, 50Ω system, R
RBIAS
= 20kΩ,
R
RLNA
= 24kΩ. Typical values are V
CC
= 2.75V, T
A
= +25°C. LO input power = -7dBm, LOW = 0V, HIGH = V
CC
, unless otherwise
noted.) (Note 1)
PARAMETER
OVERALL PERFORMANCE
Low-Band RF Frequency Range
High-Band RF Frequency
Range
Low-Band LO Frequency Range
High-Band LO Frequency
Range
IF Frequency Range
LO Input Level
(Note 2)
MAX2323 (Note 2)
(Note 2)
MAX2323 (Note 2)
(Note 2)
100Ω input impedance
850
1800
800
1600
40
-7
-5
950
2200
1150
2300
400
0
MHz
MHz
MHz
MHz
MHz
dBm
CONDITIONS
MIN
TYP
MAX
UNITS
MAX2323/MAX2325
CELLULAR LNA PERFORMANCE (MAX2323/MAX2325)
CDMA AND FM HIGH-GAIN, HIGH-LINEARITY MODES
Gain
Noise Figure
IIP3
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
9
7.5
13
2.5
2.7
4.5
T
A
= +25°C
T
A
= T
MIN
to T
MAX
8.5
5
-4.5
13
-3.5
7.5
(Note 3)
17.5
-1.5
8.5
14.5
1.7
5
16
1.9
T
A
= T
MIN
to T
MAX
14.5
15.5
1.7
10.5
17
1.9
dB
dB
dBm
CDMA HIGH-GAIN, LOW-LINEARITY PAGING MODE, AND FM HIGH-GAIN MODE
Gain
LNA Noise Figure
LNA IIP3
CDMA AND FM MIDGAIN MODES
Gain
Noise Figure
IIP3
(Note 3)
T
A
= T
MIN
to T
MAX
6
3.3
10
8
3.5
dB
dB
dBm
(Note 3)
dB
dB
dBm
CDMA AND FM LOW-GAIN MODES
Gain
Noise Figure
IIP3
PCS LNA PERFORMANCE (MAX2323)
CDMA HIGH-GAIN, HIGH-LINEARITY MODE
Gain
Noise Figure
IIP3
(Note 3)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
7
5.5
T
A
= T
MIN
to T
MAX
13.5
14.5
1.9
8
15.5
2.1
dB
dB
dBm
T
A
= T
MIN
to T
MAX
dB
dB
dBm
_______________________________________________________________________________________
3
Triple/Dual-Mode
CDMA LNA/Mixers
MAX2323/MAX2325
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2323 EV kit, F
PLNAIN
= 1960MHz, F
CLNAIN
= 881MHz, F
IF
= 110MHz, high-side LO, 50Ω system, R
RBIAS
= 20kΩ,
R
RLNA
= 24kΩ. Typical values are V
CC
= 2.75V, T
A
= +25°C. LO input power = -7dBm, LOW = 0V, HIGH = V
CC
, unless otherwise
noted.) (Note 1)
PARAMETER
CDMA HIGH-GAIN, LOW-LINEARITY PAGING MODE
Gain
LNA Noise Figure
LNA IIP3
CDMA MIDGAIN MODE
Gain
Noise Figure
IIP3
CDMA, ALL MODES
Gain
Noise Figure
IIP3
FM MODE
Gain
Noise Figure
IIP3
T
A
= T
MIN
to T
MAX
(Note 3)
1.5
PCS MIXER PERFORMANCE (MAX2323)
CDMA HIGH-GAIN, HIGH-LINEARITY MODE
Gain
Noise Figure
IIP3
T
A
= T
MIN
to T
MAX
(Note 3)
1.5
T
A
= T
MIN
to T
MAX
12
13.5
7.9
4
15.5
8.5
dB
dB
dBm
T
A
= T
MIN
to T
MAX
8.5
10
10.5
5
11.5
11.5
dB
dB
dBm
T
A
= T
MIN
to T
MAX
(Note 3)
3.5
T
A
= T
MIN
to T
MAX
11.5
13
7.5
4.8
14.5
8.5
dB
dB
dBm
(Note 3)
12
CELLULAR MIXER PERFORMANCE (MAX2323/MAX2325)
T
A
= T
MIN
to T
MAX
-2.0
-1.0
5.6
13.5
-0.5
6.0
dB
dB
dBm
(Note 3)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
4.5
3.0
T
A
= T
MIN
to T
MAX
12.5
14
1.9
5.5
14.5
2.1
dB
dB
dBm
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
Devices are production tested for functionality at frequencies stated; 30 units from 3 independent wafer lots, when one lot
was at the upper process extreme, one lot was nominal, and one lot was at the lower process extreme, were characterized.
The resulting standard deviation therefore includes process variations. Data sheet limits are ±3σ from the mean.
Note 2:
Operation over this frequency range requires the ports to be rematched for the desired operating range. Performance at
various frequencies is indicated by the S-parameter data in Tables 3–7.
Note 3:
Specifications are based on R
BIAS
= 20kΩ. I
CC
for all LNAs (except HGHL) and mixers are inversely proportional to R
RBIAS
.
IIP3 can be traded for I
CC
by selecting other values of R
RBIAS
.
4
_______________________________________________________________________________________
Triple/Dual-Mode
CDMA LNA/Mixers
Pin Description
PIN
MAX2323
1
—
2
3, 8, 11,
12, 13, 18,
24, 25, 27
4
5
6
7
9
10
14
15
16
17
19, 20
MAX2325
1
2, 10, 23
—
3, 8, 11, 12,
13, 17, 18,
24, 25, 27
4
5
6
7
9
—
14
15
16
—
19, 20
RLNA
N.C.
PLNAIN
L N A Bia s-S e t t ing P in . F o r no min a l b ia s, connect a 24k
Ω
r esist o r t o g ro u n d . T h is
r e sist o r va lu e c a n b e a d ju st e d t o a lt e r t h e lin e a r it y o f t h e inp u t L NA in hig h - g ain ,
h igh - lin ea r it y C D MA mo d e s.
No Connection. Leave this pin floating.
High-Band RF Input Port. Blocking capacitor is required, which may be used as part of
the matching network.
NAME
FUNCTION
MAX2323/MAX2325
GND
Ground
CLNAIN
SLEEP
G2
G1
LOLIN
LOHIN
MODE
FMOUT
V
CC
BAND
CDMA-,
CDMA+
RBIAS
Low-Band RF Input Port. Blocking capacitor is required, which may be used as part of
the matching network.
Logic Input. High shuts off entire device.
Logic Input. See Tables 1 and 2 for details.
Logic Input. See Tables 1 and 2 for details.
Low-Frequency LO Input Port. Requires blocking capacitor, which may be used as
part of an optional matching network.
High-Frequency LO Input Port. Requires blocking capacitor, which may be used as
part of an optional matching network.
Logic Input. See Tables 1 and 2 for details.
FM IF Output Port. Requires a pull-up inductor and a DC blocking capacitor, which
may be used as part of the matching network.
2.7V to 3.6V Supply Pin. Must be capacitively bypassed near the pin.
Logic Input. High selects high band (PCS). Low selects low band (cellular).
Differential Output Port for CDMA Mode. Requires pull-up inductors and blocking
capacitors, which may be used as part of the matching network.
Bias Setting Pin. For nominal bias, connect a 20kΩ resistor to ground. This resistor
value can be adjusted to alter the linearity of the mixers in all modes and the LNA in all
modes except high gain and high linearity.
Low-Band Mixer Input Port. Requires blocking capacitor, which may be used as part of
the matching network.
High-Band Mixer Input Port. Requires blocking capacitor, which may be used as part
of the matching network.
High-Band LNA Output Port. This port requires an external pull-up inductor and series
capacitor as part of the matching network.
2.7 to 3.6V Supply Pin. Bypassing is not necessary at this pin.
21
21
22
23
26
—
22
—
—
26
CMIXIN
PMIXIN
PLNAOUT
V
CC
_______________________________________________________________________________________
5
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